Bristle bearing surface of a toothbrush head



FIG. 1 is a front-right perspective view of a bristle bearing surface of a toothbrush head according to our design;

FIG. 2 is a left-front perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The portions of the toothbrush head shown in broken lines form no part of the claimed design. The grayscale shading represents a contrast in tone or color. 

CLAIM The ornamental design for a bristle bearing surface of a toothbrush head, as shown and described. 